294 LEAF-CELLS IN THE BRITISH HYMENOPHYLLES. 
interstices. Professor Gulliver's attention should be directed to them — 
for comparison with those of Hymenophyllum, recently described by 
him in the * Annals of Natural History.’ C. C. BaBINGTON. 
September 4, 1863. 
COMPARISON OF THE LEAF-CELLS IN THE BRITISH 
HYMENOPHYLLES. 
By Grorce Guuiiver, F.R.S., 
Professor of Anatomy and Physiology to the Royal College of Surgeons. 
Responding to the suggestion of Professor Babington, I have pre- 
pared the following notes on the leaf-cells of the British Hymenophyl- 
lee. Having been provided, through the courtesy of Mr. F. Clowes and 
Mr. N. B. Ward, with good specimens of each of these plants, I have 
made all the sketches anew, to the same scale of ;1,ths of an inch, instead 
of copying two of them from my paper in the * Annals of Natural 
History * of August last. 
Hymenophyllum Tunbridgense, Sm. — Leaf-cells nearly round, with an 
average diameter of 1. of an inch, and forming a spheerenchyma. 
Wilsoni, Hook.  Leaf-cells larger and more elongated than 
those of H. Tunbridgense, and forming an ovenchyma. ‘Their average 
long diameter sow and their short diameter 41, of an inch. 
Fig. 1. 
` All drawn to the scale of ;3;ths of an inch. 
Fig. 1. Outlines of the leaf-cells of Hymenophyllum Tunbridgense, Sm. 
Fig. 2. Ditto ditto of H. Wilsoni, Hook. 
Fig: 3. Ditto ditto of Trichomanes radicans, Sw. 
